I did a double sided DJ quilt. Doing that is where I learned precision piecing. If you have a 12" block you've got all kinds of give to make the next one work. Not so with small pieces.
I saw this week that Paperpieces now offers a DJ english paper piecing style. If my eyesight was better I'd take that on next. I used my DJ to reach myself how to applique, using that technique everywhere I could.